LANDMARC: indoor location sensing using active RFID
Wireless Networks - Special issue: Pervasive computing and communications
An RFID Distance Bounding Protocol
SECURECOMM '05 Proceedings of the First International Conference on Security and Privacy for Emerging Areas in Communications Networks
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This paper proposes a simple positioning method for small devices based on direct sequence spread spectrum signal. The proposed scheme measures the sign of inner product between reference signal from a loop antenna and the delayed signal from the double loop antenna. Thus, it can identify the region where the receiver exists based on the inner product. Numerical results show that the area where the inner product becomes negative or positive is symmetric with respect to the position of the transmitter and the inner product can be useful to detect the region where the receiver belongs.